// bigint 非常大的整数
// symbol 全局唯一引用

const oneHundred: bigint = BigInt(100)
const anotherHundred: bigint = 100n

console.log(oneHundred)
console.log(anotherHundred)

const firstName = Symbol('name')
const secondName = Symbol('name')

if (Symbol.for('name') === Symbol.for('name')) {
  console.log('for:ok')
}

if (Symbol.keyFor(firstName) === Symbol.keyFor(secondName)) {
  console.log('keyFor:ok')
}